The Hillary Clinton and Bernie Sanders campaigns are in talks to host a joint event as early as next Tuesday in New Hampshire in which an endorsement would be on the table, according to multiple reports.

NBC News' Andrea Mitchell reported Wednesday afternoon that the endorsement could come if there were "no more hitches" between the two sides.

Neither the Sanders campaign nor the Clinton campaign immediately returned a request for comment.

Sanders has refused to endorse Clinton despite her hold on the nomination but has begun to signal a softening over the past few weeks. He said last month that he'd "in all likelihood" vote for Clinton and acknowledged on multiple occasions that she'd be the party's nominee despite the continuation of his campaign as the convention approaches.

The news comes after a testy day on Capitol Hill where House Democrats peppered Sanders with questions about his commitment to the Democratic Party, a party he first joined during the primary.